Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dd2c500933364f…

MALICIOUS

PDF

119.9 KB Created: 2021-03-24 01:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 145104e29598d9f6fe6233132d1497b1 SHA-1: 13a7852479f86e94c023a9bbf6e22f701144d243 SHA-256: 45dd2c500933364f57bfd4eca25fd1b11371f30051c2b8f8203bc0db761c8b1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=the+ontological+argument+anselm+pdf PDF link annotation
    • http://menesoger.iblogger.org/fundamentos_tecnicos_del_basquetbol_resumen.pdfIn PDF document text
    • http://reveruverof.medianewsonline.com/hidradenitis_suppurativa_diet.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/secret_forex_hedging_strategy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_60125ee4aad6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467043/normal_5fec24a73c280.pdfIn PDF document text
    • https://cdn.sqhk.co/neruxojus/jjgrXZE/photomath_calculator_app.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/27491487278.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/ielts_writing_task_1_vocabulary_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc868f43aca0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444353/normal_603128e2bcb65.pdfIn PDF document text
    • http://kifejuja.medianewsonline.com/sample_letter_of_agreement_between_employer_and_employee.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/hdMhbgg/wufapixefaxelikaxigil.pdfIn PDF document text
    • http://tawexowupa.22web.org/vubezixoludupanifutonov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazadag.rf.gd/40665321643.pdfIn PDF document text
    • http://kogorokexo.rf.gd/34900436300.pdfIn PDF document text
    • http://xenivut.epizy.com/gebarurom.pdfIn PDF document text
    • http://bekisamusexasu.rf.gd/27328008953.pdfIn PDF document text
    • http://dipumekamerara.rf.gd/howard_gardner_multiple_intelligence_test_free.pdfIn PDF document text
    • http://woxunegomuwajor.rf.gd/bevogitiremopesowimavi.pdfIn PDF document text
    • http://wudafozejuniv.rf.gd/samsung_front_load_washer_error_code_e3.pdfIn PDF document text
    • http://tigodovujoxam.rf.gd/zoferevusem.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001946e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1946E 5516 bytes
SHA-256: e428e1bc3a57662935a2a6d1c039a6e3d7116699492357548116d92dbb88c3f4
font_01_sfnt_off0001a70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A70F 13660 bytes
SHA-256: 34f8104928383f24af00682c256f90e30aa0bcede6d2b112f5f08d1c8fbfe876

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